University Science Malaysia Shell Eco Marathon Team
Tuesday, July 26, 2011
Hub Design & Selection ( Part 1 )
Saturday, August 21, 2010
How Design Wheel Hub
I come from a mechanical engineering education background. Been working hands-on on various project in university, from design to fabrication. I have been working on cars, karts, engines and recently electric motors. This is my first engineering/design post to share my experience and knowledge.
Choosing the size of your wheel
The first thing that has to come in mind is “What size I want for my wheel?” Normally bicycle comes in 16”, 20”,21”,24”26” diameter wheel size. Do check with local repair shop for these sizes, and the spokes length available. You would want a hub designed and you can't put into a rim because you’ve got no suitable spokes for it. Do design a hub with minimal post machining work.
Big Wheel or Small Wheel?
Big wheel needs a bigger torque to initial the rolling but possesses larger rolling momentum once it rolls on a specific speed.
Therefore, designer needs to play around with the torque formula-Torque=Force x Radius and find the compromising values from these parameter.
Normally, when deciding the wheel size for the vehicle, driving wheel should be as close to sprocket size for minimal force required to drive the veh
icle and driven wheel should be as big as possible to be driven at ease.
Choosing the right type of bearings
What makes the wheel roll? Bearings of course. Normal bicycles use ball bearings; some wheel chairs use sealed bearings. When designing a wheel hub, it is necessary to think what type of forces will be exerted on the wheel. A steered wheel will experience radial force from reaction force from ground, lateral force when the car steers. Hence we need to choose bearing which design for these two predominant forces. Normal seal bearing will only withstand radial force and could not handle lateral axial force. In this case, angular contact bearing is recommended.
A Legacy to be Hold
Actually, things were getting smooth during the inspection. USM GEN2 passed the inspection quite early among the Malaysian teams. We also been selected for the parade during opening ceremony. This car possessed an unique feature of having natural jute composite as material for the shell of the vehicle. It also has a special design of rear wheel steering which catches the attention of all visitor to our pit.
During the track run, we suffered a major blow which prevents us from finishing the laps. Sepang Circuit has a challenge which Europeans competition doesn't have. There is a steep slope for after the second turn. We are lacking gear ratio hence we cant climb the slope. It was disappointing and the team manager- David did not feel good all day long so did Horizon our prof.
Saturday, June 5, 2010
Shell Eco-marathon Asia 2010 - Showcase of Malaysian Teams
Shell Eco-marathon Asia 2010 - Showcase of Malaysian Teams
Date: Wednesday, June 2, 2010
Time: 12:00 p.m. to 1:30 p.m.
Venue: Auditorium Cempaka Sari, Presint 3
(Opposite Palace of Justice)
Kompleks Perbadanan Putrajaya, Putrajaya
PROGRAMME:
11:30am – 12:00pm: Arrival of Guests 12:00pm – 12:05pm: Welcome by Emcee 12:05pm – 12:15pm: Speech by En. Anuar Taib, Chairman, Shell Malaysia 12:15pm – 12:25pm: Speech by Datuk Seri Mohamed Khaled Nordin, 12:25pm – 12:35pm: Video presentation of the Shell Eco-marathon 12:35pm – 12:45pm: Unveiling of Shell Eco-marathon Asia - Best Malaysian Team Challenge Trophy by En. Anuar Taib and 12:45pm – 13:00pm: Symbolic Flag-Off of vehicles at the entrance of 13:00pm – 13:30pm: Press Conference 13:30pm – 14:30pm: Tour of student teams booths showcasing their vehicles designs at the Foyer Buffet Lunch 14:30pm: End
Minister of Higher Education
Datuk Seri Mohamed Khaled Nordin
Auditorium Cempaka Sari
We arrive at Putrajaya at about 9am and had the chance to have a look around the place. Here are some pictures taken from the surroundings:
Wednesday, May 26, 2010
New Race Format
New Race Format: Old Race Format:
4 Laps 6 Laps
Number of attempt: 5 4
Time Limit 23 minutes 35 minutes
Distance Covered: 11.2 Km 18.2 km
Average Speed: 30km/hour 30km/hour
This change was announced on 24th May. This change is to reduce congestion and logistics issues.
No Driver change, no pit stop for Prototype category.
(Less Driver, Less Uniform Cost)
Tuesday, May 18, 2010
Selected 10 for SEM media event
Shell Eco-marathon Asia 2010 - Showcase of Malaysian Teams
Date: Wednesday, June 2, 2010
Time: 10:00am - 11:30am (followed by lunch)
Venue: Putrajaya - exact venue to be confirmed.
Programme
9:30 - 10:00 Arrival of Guests
10:00 - 10:05 Welcome by Emcee
10:05 - 10:15 Speech by En. Anuar Taib, Chairman, Shell Malaysia
10:15 - 10:25 Speech by VIP from Ministry of Higher Education
10:25 - 10:35 Video presentation of the Shell Eco-marathon
10:35 - 10:45 Unveiling of Shell Eco-marathon Asia - Best Malaysian Team Challenge
Trophy by En. Anuar Taib and VIP from Ministry of Higher Education
10:45 - 11:00 Symbolic Flag-Off of vehicles at the entrance of auditorium
11:00 - 11:30 Press Conference
11:30 - 12:30 Tour of student teams booths showcasing their vehicles designs at the foyer/lobby
Buffet Lunch
12:30 End